<template>
  <div>
    <div class="container">
      {{ upload_file || "导入" }}
      <input
        type="file"
        accept=".xls,.xlsx"
        class="upload_file"
        @change="readExcel($event)"
      />
    </div>
  </div>
</template>

<script>
import XLSX from "xlsx";

export default {
  data() {
    return {
      upload_file: "",
      lists: []
    };
  },
  methods: {
    submit_form() {
      // 给后端发送请求，更新数据
      console.log("假装给后端发了个请求...");
    },
    readExcel(e) {
      // 读取表格文件
      let that = this;
      const files = e.target.files;
      if (files.length <= 0) {
        return false;
      } else if (!/\.(xls|xlsx)$/.test(files[0].name.toLowerCase())) {
        this.$message({
          message: "上传格式不正确，请上传xls或者xlsx格式",
          type: "warning"
        });
        return false;
      } else {
        // 更新获取文件名
        that.upload_file = files[0].name;
      }

      const fileReader = new FileReader();
      fileReader.onload = ev => {
        try {
          const data = ev.target.result;
          const workbook = XLSX.read(data, {
            type: "binary"
          });
          const wsname = workbook.SheetNames[0]; //取第一张表
          const ws = XLSX.utils.sheet_to_json(workbook.Sheets[wsname]); //生成json表格内容
          that.lists = [];
          // 从解析出来的数据中提取相应的数据
          ws.forEach(item => {
            that.lists.push({
              username: item["用户名"],
              phone_number: item["手机号"]
            });
          });
          // 给后端发请求
          this.submit_form();
        } catch (e) {
          return false;
        }
      };
      fileReader.readAsBinaryString(files[0]);
    }
  }
};
</script>
